I thought the Microsoft conference was great. By no means enough to convince me to jump in at launch, but enough to reassure me the system may be worth owning in its first year on the market. Basically the attitude I have towards Wii U, which I'm yet to buy.
Some great games, some duds, surprisingly well paced conference. That price, particularly here in the UK, is too steep for me to justify at the end of the year, particularly if I've got a Wii U purchase to make. All said and done, though, a very good start to E3.